Malicious PDF — malware analysis report

Static analysis result for SHA-256 b373b156f5e15c0a…

MALICIOUS

PDF

72.8 KB Created: 2021-01-29 08:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1e591d8c33399970dfa0a772b7ff13f2 SHA-1: 2f3f483e0de7da8c57ae47e75e97a2c847138a85 SHA-256: b373b156f5e15c0ab7c8fbf07002a1c762138b6ed084a2db9e577ea4d5cc8de7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with a prominent one being 'https://leonvi.ru/123?utm_term=free+pinoy+tv+shows+online'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. Although no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=free+pinoy+tv+shows+online PDF link annotation
    • http://lixakux.22web.org/disorufekuwalotalogoko.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/gdggOQc/zetaluritijuxelewejajezi.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/hiCRgiB/talking_tom_gold_run_games_download.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/top_virtual_world_apps_gamesqdygt.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/uWhcVhb/miwefevixexixitekafibin.pdfIn PDF document text
    • http://itabody.space/world_war_z_audiobook_download_mp38zog1.pdfIn PDF document text
    • http://zoo-taxi.site/jetaselufatubagufexup08uxr.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/resume_templates_in_word.pdfIn PDF document text
    • http://monanuzusud.22web.org/50580423859.pdfIn PDF document text
    • http://xevokegejir.iblogger.org/gujarati_calendar_june_2019.pdfIn PDF document text
    • http://vannlight.ru/alone_whatsapp_status_malayalam_downloadfr06t.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/ihgijdH/android_update_messages_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowisekek.rf.gd/alcatel_3v_operating_manual.pdfIn PDF document text
    • http://zivikabazixo.epizy.com/confluence_template_variable_default_value.pdfIn PDF document text
    • http://wotisonuli.epizy.com/business_games_free_apps.pdfIn PDF document text
    • http://sewasijibakel.epizy.com/83586238623.pdfIn PDF document text
    • http://bubezowi.epizy.com/vasogomepubopovez.pdfIn PDF document text
    • http://pivekukevojadu.epizy.com/befazu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 4908 bytes
SHA-256: f82b8379e52ea3969264be5576f2eb7d940e28f00d1c57da13037f8253806f79
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10504 bytes
SHA-256: df8718d40ab4137b07d017cfd06e1fbe864a94ab9fd4567898eaba1fbaae28ba

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